From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Mon, 10 Jan 2022 02:50:00 +0100
Subject: PCI: aardvark: Check return value of generic_handle_domain_irq() when
 processing INTx IRQ
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Git-commit: 51f96e287c6f003d3bb29672811c757c5fbf0028
Patch-mainline: 5.18-rc1
References: git-fixes

It is possible that we receive spurious INTx interrupt. Check for the
return value of generic_handle_domain_irq() when processing INTx IRQ.

[js] 5.14 still uses generic_handle_irq()

Link: https://lore.kernel.org/r/20220110015018.26359-6-kabel@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/pci/controller/pci-aardvark.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -1428,7 +1428,9 @@ static void advk_pcie_handle_int(struct
 			    PCIE_ISR1_REG);
 
 		virq = irq_find_mapping(pcie->irq_domain, i);
-		generic_handle_irq(virq);
+		if (generic_handle_irq(virq) == -EINVAL)
+			dev_err_ratelimited(&pcie->pdev->dev, "unexpected INT%c IRQ\n",
+					    (char)i + 'A');
 	}
 }